1. Henderson E, Continente X, Fernández E, Tigova O, Cortés-Francisco N, Gallus S, Lugo A, Semple S, O’Donnell R, Clancy L, Keogan S, Ruprecht A, Borgini A, Tzortzi A, Vyzikidou VK, Gorini G, López-Nicolás A, Soriano JB, Geshanova G, Osman J, Mons U, Przewozniak K, Precioso J, Brad R, López MJ; TackSHS project investigators. Secondhand smoke exposure in outdoor children’s playgrounds in 11 European countries. Environ Int. 2021 Apr;149:105775. doi: 10.1016/j.envint.2020.105775. Epub 2020 Nov 20. PMID: 33228970.